I would like to add a banner advert at the top right of my website (MostFish.com), below the search facility and to the right of the site logo. Can you tell me what code I should add and where abouts in the header.php file.

I have inserted the code into the header.php on the next line to the one you suggested. However, could you take a look at MostFish.com and you’ll see that it has pushed the navigation bars and content down the page. Are you able to tell me how to stop this from happening and at the same time move the banner down below the search bar?